package com.ruoyi.amuse.sensitiveWords;

import java.util.*;

public class SensitiveWordsUtil {
    public static Map<String,String> wordMap;
    public static int minMatchTYpe = 1;      //最小匹配规则
    public static int maxMatchType = 2;      //最大匹配规则

    /**
     *	添加敏感词库到敏感词工具类中
     */
    public static void addBadWordToHashMap(Set<String> keyWordSet) {

        //初始化敏感词容器，减少扩容操作
        wordMap = new HashMap(keyWordSet.size());
        String keyWord = null;
        Map nowMap = null;
        Map<String, String> newWorMap = null;

        //遍历keyWordSet中的每一个keyWord
        Iterator<String> iterator = keyWordSet.iterator();
        while(iterator.hasNext()){

            keyWord = iterator.next();
            nowMap = wordMap;

            //遍历keyWord中的每一个字符
            for(int i = 0 ; i < keyWord.length() ; i++){

                char keyChar = keyWord.charAt(i);
                Object wordMap = nowMap.get(keyChar);

                //如果存在该key，直接赋值
                if(wordMap != null){
                    nowMap = (Map) wordMap;
                }
                else{
                    //不存在则，则构建一个map，同时将isEnd设置为0，因为不是最后一个字符
                    newWorMap = new HashMap<String,String>();
                    newWorMap.put("isEnd", "0");
                    nowMap.put(keyChar, newWorMap);
                    nowMap = newWorMap;
                }
                if(i == keyWord.length() - 1){
                    //最后一个字符
                    nowMap.put("isEnd", "1");
                }
            }
        }
    }

    /**
     * 替换敏感字字符
     * @param txt
     * @param matchType
     * @param replaceChar 替换字符，默认*
     * @version 1.0
     */
    public static String replaceBadWord(String txt, int matchType, String replaceChar){
        String resultTxt = txt;
        //获取所有的敏感词
        Set<String> set = getBadWord(txt, matchType);
        Iterator<String> iterator = set.iterator();
        String word = null;
        String replaceString = null;
        while (iterator.hasNext()) {
            word = iterator.next();
            //替换敏感词
            replaceString = getReplaceChars(replaceChar, word.length());
            resultTxt = resultTxt.replaceAll(word, replaceString);
        }

        return resultTxt;
    }

    /**
     * 获取文字中的敏感词
     * @param txt 文字
     * @param matchType 匹配规则 1：最小匹配规则，2：最大匹配规则
     * @return
     * @version 1.0
     */
    public static Set<String> getBadWord(String txt , int matchType){
        Set<String> sensitiveWordList = new HashSet<String>();

        for(int i = 0 ; i < txt.length() ; i++){
            //判断是否包含敏感字符
            int length = checkBadWord(txt, i, matchType);
            //存在,加入list中
            if(length > 0){
                sensitiveWordList.add(txt.substring(i, i+length));
                //减1的原因，是因为for会自增
                i = i + length - 1;
            }
        }

        return sensitiveWordList;
    }

    /**
     * 检查文字中是否包含敏感字符，检查规则如下：如果存在，则返回敏感词字符的长度，不存在返回0
     * @param txt
     * @param beginIndex
     * @param matchType
     * @return，
     * @version 1.0
     */
    @SuppressWarnings({ "rawtypes"})
    public static int checkBadWord(String txt,int beginIndex,int matchType){
        //敏感词结束标识位：用于敏感词只有1位的情况
        boolean  flag = false;
        //匹配标识数默认为0
        int matchFlag = 0;
        char word = 0;
        Map nowMap = wordMap;
        for(int i = beginIndex; i < txt.length() ; i++){
            word = txt.charAt(i);
            //获取指定key
            nowMap = (Map) nowMap.get(word);
            //存在，则判断是否为最后一个
            if(nowMap != null){
                //找到相应key，匹配标识+1
                matchFlag++;
                //如果为最后一个匹配规则,结束循环，返回匹配标识数
                if("1".equals(nowMap.get("isEnd"))){
                    //结束标志位为true
                    flag = true;
                    //最小规则，直接返回,最大规则还需继续查找
                    if(minMatchTYpe == matchType){
                        break;
                    }
                }
            }
            else{     //不存在，直接返回
                break;
            }
        }

        if(!flag){
            matchFlag = 0;
        }
        return matchFlag;
    }



    /**
     * 获取替换字符串
     * @param replaceChar
     * @param length
     * @return
     * @version 1.0
     */
    private static String getReplaceChars(String replaceChar,int length){
        String resultReplace = replaceChar;
        for(int i = 1 ; i < length ; i++){
            resultReplace += replaceChar;
        }

        return resultReplace;
    }
}
